Machine for drying veneers



Dec. 11, 1 928.

5 Sheets-Sheet 1 L f'bbn nsl'eu n INVENTOR 4, ATTORNEK L RUBINSTEINMACHINE FOR DRYING VENEERS Filed Oct. 1, 1927 L. RUBINSTEIN MACHINE FORDRYING VENEERS Dec. 11, 1928.

5 Sheets-Sheet 2 we Q Med Oct. l,

Leo @bmsfel n INVE/V T01? BY L 4. ATTORNEY.

Dec. 11, 1928. 1,694,489

L. RUBINSTEIN MACHINE FOR DRYING VENEERS Filed Oct. 1, 1927 5Sheets-Sheet 3 Leo @binsl' m INVENTOR 6. A TTOR/VE Y.

Dec. 11, 1928, 1594 489 L. RUBlNSTElN MACHINE FOR DRYING VENEERS FiledOct. 1, 1927 5 Sheets-Sheet Fig.6

ATTORNEY Dec. 11, 1928. r 1,694,489

L. RUBINSTEIN MACHINE FOR DRYING VENEERS Filed on; 1, 1927 5Sheets-Sheet 5 Fig. 10

Leo Ruin nskem IIVVENTOR 4 ATTORNEY.

Patented Dec. 11,1928.

UNITED sraras LEO RUBIN STEIN, 0F VIENNA, AUSTRIA.

MACHINE FOR DRYING VENEERS.

Application filed October 1, 1927, Serial 110.223331. and in AustriaOctoBer 9, 1926.

The invention relates to a machine for drying veneers in which thedrying is effected by means of moving heaters. Heretofore the dryingofveneers by means of moving heaters was effected in such a manner thatthe moving heaters were moved along-stationary veneers or piles ofveneers. This method of drying requires many hand OPGIZLtlODS andimplies a great expenditure in time and labour.

The object of the invention is to carry out the drying of veneers-bymeans of moving heaters in a simple and reliable manner by a machine andto provide a machine capable of reliably drying veneers of differentlengths and thicknesses as well as of different degrees of moisture withthe best drying results. This object is attained according to theinvention by providing the machine with devices for moving theveneersalong the moving heaters.

1n the drawings a constructional form of the machine is illustrated byway of example.

Fig.1 is a side elevation and Fig. 2 is a plan View of the machine. Fig.3 is an elevation partly in section on a larger scale. of the mechanismfor feeding the veneers and of the arrangement of the heaters. Fig. 4 isa section on the line IV-IV Fig. 3. -Fig. 5 is a section on the line VVFig. 3. Figs. 6 and 7 show the heater in side elevation and plan viewrespectively. Fig. 8 is a section on the line VIIIVIII' Fig.- 6 on alarger scale.

Fig. 9 is a side elevation on a larger scale of the cooling apparatusprovided at the end of the machine. Fig. 10 is a plan view of Fig. 9.

The machine comprises a plurality of mov: ng heaters 1, 2, 3, 4, 5, 6past which the veneers to be dried are moved. 10, 11, 12, 13,

14,15,16 and 20, 21, 22, 2a, 24., 25 are mechanlsms for moving theveneers past the movmg heaters 1 to 6. These mechanisms consist offeeding devices 10, 11, 12, 13, 14, 15, 16 engaging the veneers and ofguides 20, 21, 22, 23, 24,25 for the veneers. The guides 20 to 25 arearranged opposite the moving heaters 1 to 6. The moving heaters 1 to6and the guides 20 to 25 are arranged between the feeding devices 10 to16. 3

In the constructional form shown byway of example the heaters 1 to 6,the feeding devices 10 to 16 and the guides 20 to 25 resemble each otherrespectively, hence it is suflicient to describe only one of each ofthese elements.

As is more particularly shown in Fig. 3 the slidable in the standardsfeeding. devices 10 to 16 consist each of a pair of rollers 30, 31having their axles 32, 33 journalled 1n bearings 34, 35. The bearings34,

suspended on the longitudinal beams 45, 46'

by means of rods 43, 44. The longitudinal beams 45, 46 are connected bytransverse bars 48 to form a slide'in' the form of a frame. This slideforms the support for all the heating blocks and is reciprocated by anactuating gear 50 as hereinafter more fully described. Rollers 52 areloosely mounted on the transverse bars 48; these rollers run on theguides 53. The guides 53 are vertically 36 for the bearings andareprovided as is shown in Fig. 3 with adjusting inclines 55- resting oninclines 56 of an adjustingframe 58 parallel to the direction of thefeed. The adjusting frames are movably mounted in guides 60 of thestandards 36for the bearings and are so connected with each otherby'rods 61 that all,

I the adjusting frames may be adjusted from a single point.

The mechanism for operating the adjusting frames 58 consists of a handwheel 63 to the shaft 64 of which worms 65 are secured. The worms65engage into worm Wheels 66 cooperating with actuating screws 67. Theactuating screws 67 are connected by the rod 61 to the adjusting frames58. By means of.

the mechanism above described the guides for the slide 45, 46, 48 onwhich the heating blocks 40 are suspended may be adjusted verticallywhereby at the same time the heating blocks 40 are adjusted relativelyto the guidesQO to 25 for the veneersl.

The heating blocks 40 are resiliently yieldingly mounted relatively tothe guides 20 to 25 of the feed waylocated opposite such heating blocks.For this purpose the suspending rods 43', 44 (Figs. 4 and 5) areslidably mounted in supporting sleeves .70 of the longitudi nal beams45, 46 and are held above such sleeves 70 by springs 72. The one of thethrough the heating blocks and communi-' or 4 1 and secured to theheating block 40 by screws 78. By turning the spring abutment 76 eachheating block may be nicely adjusted vertically. By turning the nuts 74,that is to say by adjusting the other spring abutment 73 the tension ofthe spring 72 may be adj sted.

The heating blocks 40 are provided with heating devices. In the exampleshown the heating device consists of a steam duct. Channels 80, 81extend longitudinally cate with each other at one side of the heatingblock b a connecting pipe 82. At the other side of each heating blockconnecting pieces or ajutages 83, 84 are provided for establishingcommunicatio n with the admission and escape of the heating agent. Inthe example shown the heating blocks 40 are made of some light metal.The channels 80, 81 through which flows the heating agent are formed bytubes 86, 87 of a metal higher specific weight such as brass, iron orthe like embedded in the body 40 of light metal. The operative heatingsurface of each heating block is provided with a covering 88 likewisemade of a metal of higher specific gravity for instance of brass.

The covering 88 is secured to the light metal block in any suitablemanner for instance by screws. The longitudinal edges 89, 90 of thecovering 88 are inclined upwards so that the veneer running through themachine may slip in below the covering 88 without stickmg. I

The guides 20 to 25 arranged opposite the moving heaters are providedwith plane guide faces 95. The parts 96, 97 of the side edges in theneighbourhood of the pairs of feed rollers are bevelled downwardly.Thereby a smooth running" up of the veneer onto the guide faces issecured. The guides are provided with chambers100, 101 for introducingthereinto a heating agent for instance steam. In the example shown eachguide is provided with two steam chambers" 100, 101 which on the oneside communicate with each other by an opening in the partition 102. Onthe other side of the heating chambers 100, 101 holes 104, 105 are pro-Vidvd i'or the admission and the escape of the heating agent. The guidesare interposed v: means of screws 110, 111, 112, 113 betweenthestandards 36 for the bearings of the pairs of eml rollers in themanner illustra ed in Fig. 3. The mode of securing the guides inposition permits of a nice adjustment of the sunrrelatively to thebottom feed rollers and thereby also a nice adjustment of the feed pat hof the machine. I

The heating of the heaters 1 to 6 and of the guide 23 are connected byducts 125, 126, 127

and 128, 129 respectively with the guides 22, 21, 20 and '24, 25respectively .while the heaters are connected with one another. beginningwith the middle heater by 00111111111111? eating ducts 123, 132,133, 134, 135. The,

heating agent escapes from the guide 20 through a duct 137, from theguide 25 through a duct 138, from the heater 1 through the flexible'hose139 and fromtheheater6through the flexible hose 140. 141 designates theheat ing agentescape duct common to heaters and guides. The fact, thatheating agent flowing in succession through the guides and heatersbeginning with the middleguide 23 and the middle heater,secures that thetemperature of the heaters and of the guides is lower at the beginningand at the end of the feed path than in its'middle';

The machine is further provided with a cooling apparatus, which eifects'a cooling of the heated veneers dried in the machine. The coolingapparatus consists as is shown in Figs. 1 and 2 of feeding devices 17,18 and of cooled guides 26, 27 for the veneers. The feeding devices 17,18 are similar in construction to the feeding apparatus 10 to 16 andconsists of pairs of rollers 150, 151 journalled in standards 152. Theguides 26, 27 consistof plane guide plates 155 having arranged belowthem cooling channels for instance a cooling coil 157. The cooling coilsof the guides 26, 27 communicate with each other by a connecting pipe190. 191 is the supply duct for the cooling agent, 192 is the escapeduct therefor.

The driving mechanism 01am machine consists 'of a driving gear 50 forbringing about the reciprocating movement of the heaters. The drivinggear for the pairs of feed rollers consists of a step pulley the shaft161 of which carries a worm 162. The worm 162 engages into. a worm wheel163 secured toa shaft 165 journalled laterally of the bottom rollers ofthe pairs of feed rollers. On the shaft 165 bevel wheels 166 are mountedwhich cooperate with bevel wheels 167 of the bottom rollers 31 and 151respectively. The rotary movements of the bottom rollers '31. and 151respectively are transmitted to the top rollers by means of pairs ofspur-wheels 170,171. r

The driving gear of the heaters 1 to,6 conmemes sists of two crank gears50 connected by links 17 5 to the longitudinal beams 45, 46 of the slidecarrying the heaters 1 to 6. The cranks 50 are mounted on a shaft 176carrying the step pulley '177 and a belt pulley 178 and an idle pulley17 9. The step pulley 177 drives the step pulley 160 by means of a belt180.

On actuating the pulley 178 on the one hand the cranks 50 and on theother hand the pairs of feed rollers are revolved through the medium ofthe parts 177, 180, 160, 161, 162, 163, 165, 166, 167. The cranks 50bring about reciprocating movements of-heaters 1 to 6. In thesereciprocating movements the heaters are exactly guided by the rollers52, 52. The veneers to be dried are introduced into the first pair offeed rollers and are en-' gaged successively by the feed roller pairsand fed. The onward moving veneers are guided in the spaces betweensuccessive pairs of feed rollers by the heated guides 20 to and then aby the cooledguides'26 and 27. The heaters 1 to 6 are reciprocated bymeans of the cranks 50 above the veneers thus moving them onward andbringing about the drying of the veneers. The heaters may either be incontact with the veneers or may exert their drying action while movingat a slight distance from the veneers. In the present machine theveneers therefore move between the reciprocating heated heaters 1 to 6and the stationary likewise heated guides 20 to 25.

The temperature of the heaters and heated guides at front end in thedirection of the feed of the veneers being lower than that of theheaters and heated guides in the middle of the feed path, the drying isnot sudden hand wheel 63 all the adjusting inclines 58 are displace-dhorizontally their adjusting faces 56 slide on the adjusting faces 55and cause the guides 53 for the rollers 52 of the slide 45, 46, 48 to beraised or lowered. By adjusting the spring abutment nuts 76 each in-'dividual heating block could be adjusted vertically. The step pulleygearing 177, 180, 160 permits to govern the speed of the forwardmovement of the veneers relatively to the movements of the heaters andtherefore to control the drying.

The machine shown in the drawings is only an example of carrying thepresent invention into practice. The details of the machine much lowerthan those, of the known veneer drying machlnes.

What I claim is:

1. Ina machine for drying veneers, the

combination of heaters, means for moving the heaters'in the directionofthe veneers, and means for feeding the veneers to be dried past thesaid heaters along a feed path.

2. In a machinefor drying veneers the combination of heaters, means formoving the heaters in the direction of the veneers, and

means for feedingthe veneers to be dried past the said heaters along afeed path, such latter means comprising guides located opposite the saidheaters and a plurality of feeding devices adapted to engage the veneersguides might be of any each of such feeding devices being interposedbetween two successive guides. 3. In a machine for drying veneers thecombination of heaters, means for moving the heaters and means forfeeding the veneers to be dried past the said heaters along a feed pathsuch latter means comprising a plurality of guides located opposite thesaid heaters, means for heating the said heaters and guides and. meansfor keeping the temperatureof the heaters and guides in themiddle of thefeed path at a higher level than at the ends of such feed path. 4. In amachine for drying veneers th combination of heaters, means for movingthe heaters and means for feeding the veneers to be dried past the saidheaters along a feed path such latter means comprising apluralityofguides located opposite the said heaters heating chambers individuallyassociated to the said guides means for connect ing in series theheating chambers of the said guides beginning at the middle'of the saidfeed path and ending at the ends of such feed path and "means forsupplying a fluid heating agent tothe heating chambers at the middle ofthe feed path and for drawing off the heaping agent atthe ends of thesaid feed pat 5. In a machine for drying veneers the combination ofheaters, means for moving the heaters andmeans for feeding the veneersto be driedpast the-said heaters along afeed path, such latter meanscomprising a plural- .ity of guides located opposite the said heatersand means for adjusting all the heaters simultaneously relatively to-thesaid guides. 6. In a machine for'drying veneers the combination ofheaters, means for moving the heaters, means comprising a slide carryingthe heaters, guides for such slide and means for adjusting the saidslide .g ides, with means for feeding the veneers past the said heatersalong a feed path.

7. In a machine for drying veneers th combination of heaters, means formoving the heaters, such means comprising a slide carrying the heaters,guides for such slide and means for adj ustingthe said slide guides,

I such adjusting means comprising inclines on the slide guides adaptedto engage with the inclines on the said slide and means forsimultaneously adjusting the slide inclines,v

with means for feeding the veneers past the said heaters along a feedpath.

8. In a machine for drying veneers the combination of heaters, meansformovingthe heaters, such means comprising a slide consisting oflongitudinal beams, transverse bars connecting such longitudinal-beamsmeans for suspending the said heaters on the said. longitudinal beams,with guides; for the slide, such guides being adapted to cooperate: withthe said transverse bars, and means for feedinr the veneers past thesaid heaters along a feed path.

9. In a machine for drying veneers the combination of heaters, means forheating such heaters, comprising heating channels adapted to receive aheating fluid, connections between the heating channels of successiveheaters connecting such channels in series beginning at the middleheater and ending at the end heaters of the series, a supply pipe forfluid heating agent leading to the middle heater and escape pipes forthe fluid heating agent from the end heaters and of means for feedingthe veneers past the said heaters alonga feed path. 1 a

" 10. 'In a machine for drying veneers the combination of heaters, meansfor moving the heaters 1n the directlon of the veneers passing throughthe machine, and means for feeding the veneers to be dried past'the saidheaters along a feed path and of a cooling device for the veneerslocated at one end of the feed path.

11. In'a machine for drying veneers thecombination of heaters, means formoving the heaters and means for feeding the veneers to be dried pastthe said heaters along a feed path and of a cooling device for theveneers located at one end of the feed path such cooling devicecomprising a feed device and plates provided with channels for a coolingagentto:

pass through such cooling plates being ar;-

of successive cooling plate "being connected.

with each other.

13. Ina machine for drying veneers the combination of heaters, means formoving the heaters and means forfeeding the veneers to be dried past'thesaid heaters along a feed path and means for varying the speed of thefeed of the veneer with relation to the speed of movement of theheaters.

' In testimony whereof I aifix my signature.

Inc. LEO RUBINSTEIN;

